manners 成语

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forget your manners

forget to be polite, forget to say please etc. "When I reached in front of Mac, he said, ""Forget your manners?"""

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mind your manners

be polite, be courteous, watch your P's and Q's "At the wedding, Mom said to me, ""Now, Son, mind your manners."""

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Manners make the man.

Possibly: a person's manners show their origins.

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company manners

company manners
One's best behavior, as in George never interrupts when we have guests; he has fine company manners. This term employs company in the sense of “guests.” An older variant, Tell me thy company and I'll tell thee thy manners, uses company in the sense of “companions.” The current term implies that one is more mindful of politeness with invited guests.